Repo Gardening: log failures to send Slack messages

[jeherve]

Fixes #40366

Proposed changes:

Until now, we used to try to send messages to Slack, and didn't do anything if the message could not be sent. We'll now log the message, either by sending a Slack message to myself, or the Quality team for folks outside of the Automattic organization.

This will allow us to better detect triage Slack actions that could not be completed, because a team no longer exists and their Slack channel has been archived for example.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

• p1732723599754299-slack-C05KLDWRGAX

Does this pull request change what data or activity we track or use?

No

Testing instructions:

This can be tested in a fork. Here is an example:
jeherve#187

Here is the resulting message: p1732803634693709-slack-CN2FSK7L4

[github-actions]

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[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WordPress.com Simple site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin, and enable the update/repo-gardening-slack-report-message branch.

  • For jetpack-mu-wpcom changes, also add define( 'JETPACK_MU_WPCOM_LOAD_VIA_BETA_PLUGIN', true ); to your wp-config.php file.

• To test on Simple, run the following command on your sandbox:

  bin/jetpack-downloader test jetpack update/repo-gardening-slack-report-message
  

  bin/jetpack-downloader test jetpack-mu-wpcom-plugin update/repo-gardening-slack-report-message
  

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[zinigor]

I have no problems with this, except I don't know how to test it. But you have probably done it yourself.

[anomiex]

Why not send all to the channel?

[jeherve]

I think that's what we'll end up doing on the long term, but for now I'd like to monitor the assignment list closely, especially as more teams get re-orged.